P0171 | Misfires and smokes. Gen 1 Toyota Highlander 2003

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P0171 | Misfires and smokes. Gen 1 Toyota Highlander 2003

Рет қаралды 23,095

2 жыл бұрын

Steve goes through a DIY friendly approach to a check engine light and poor performance. The PCM is reporting a lean condition P0171and is adding as much fuel as it can. All that extra fuel is causing misfires and noxious exhaust.
We test the air/fuel ratio sensor, which was the cause of the problem and replace it.
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Пікірлер: 84

@oiseaurouge6664 2 ай бұрын

Wow! Steve, thank you for the thorough, step-by-step demo. I have an 03 Toyota and It's been a super-reliable 3.0L V6 SUV :-)

@ToolDemos 2 ай бұрын

Great to hear, thanks. 👍

@NutsandBoltswithTone 2 жыл бұрын

great video steve. i love how you explained the problem. I like the idea of swapping the sensors that was a good idea especially since these sensors are difficult to test.

@ToolDemos 2 жыл бұрын

Thanks Tony, I really appreciate that. It’s encouraging to have someone with your expertise validate what I’m doing.

@CPthetooladdict 2 жыл бұрын

Hope you have better luck getting parts then I do I've been waiting for 3 weeks for parts for highlanders!! Great video brother your patience is very inspiring Steve!

@ToolDemos 2 жыл бұрын

This whole shortage thing sucks - but for me, it’s a hobby. For you and all the pros out there, this is how you feed your family. And that must really suck.

@CPthetooladdict 2 жыл бұрын

@@ToolDemos it sucks for everyone I know guys that can't drag race because they can't get parts the world is slowly shutting down

@ToolDemos 2 жыл бұрын

That’s a real bummer.

@TurboTyTy 2 жыл бұрын

Good job Steve, cant wait to see what else is gonna be done to this highlander.

@ToolDemos 2 жыл бұрын

Thanks, Tyler. A bunch o’ stuff, for sure.

@greasee.monkey7224 2 жыл бұрын

Awesome video Steve! I like how you isolated the problem without 3000 steps. 👍👍

@ToolDemos 2 жыл бұрын

I’m glad you thought so. Thanks.

@miti4256 Жыл бұрын

Outstanding video. I've been looking for a view from the driveshaft perspective.

@ToolDemos Жыл бұрын

That’s great! Glad it was helpful.

@betty3.14 Жыл бұрын

Thanks for this video! I unfortunatley am not car handy at all. I have an 2004 (113k) and it smells like this for a few years now. I even took it to a shop because it was soooo gassy smelling and they told me it was fine, so I left it alone. But I know something is not right. I will have to find myself a better shop. Aside from the gas smell my Highlander haas been wonderful, but it needs some special attention now because I have slacked on all my maintenance for years. Thanks again for all your good advice!

@ToolDemos Жыл бұрын

Yeah, unfortunately there are several issues that can cause a problem like this. I hope you find a good shop.

@yukoncornelius9377 7 ай бұрын

Steve! Would love a quick video on how to adjust the idle speed on the Highlander. Great videos

@ToolDemos 7 ай бұрын

Thanks. Is your idle too high or low?

@yukoncornelius9377 7 ай бұрын

To high

@user-ss8yu4rl9s 3 ай бұрын

Great explanation. Didn't know this vehicle has 2 AF sensors

@ToolDemos 3 ай бұрын

Thanks.

@nutzboltztoolz2734 2 жыл бұрын

Nice Demo 🤘

@ToolDemos 2 жыл бұрын

I appreciate that, thank you.

@JF-sv7qo 5 ай бұрын

Hi; where you able to diagnose the situation that was causing all the contamination on the bank 1

@ToolDemos 5 ай бұрын

The oxygen sensor replacement did seem to do the trick. But I got rid of it right afterwards, so I can’t confirm a complete fix.

@24hourgmtchannel64 2 ай бұрын

So my wife's RX300 has the same 1MZFE v6 and a P0171 but unlike yours, both banks long and short term trims are nearlly identically increased 19% short and 52% long. Any sugestions would be appreciated.

@ToolDemos 2 ай бұрын

Check that the MAF sensor is reading correctly. If so, look for a vacuum leak. Probably around the intake manifold area.

@albertomacias2028 6 ай бұрын

My 2003 Toyota Highlander 292,000 miles and still going! After changing my spark plugs and ignition coils, I got the codes for cylinder 1,3 & 5 too. Did doing this solve the problem?

@ToolDemos 6 ай бұрын

Yes it did.

@The_Controversial 6 ай бұрын

If you got them yet, did it fix it for yours?

@markeast9221 6 ай бұрын

Wait a minute , After the switch ,why didn't the other sensor go up to the 50s ! It stayed low ?????

@ToolDemos 6 ай бұрын

Electronics are weird. My assumption is that moving it around made it ‘work’. Kinda like when you bang on the dash to get the fuel gauge to ‘work’.

@markeast9221 6 ай бұрын

Then why order a part if that fixed it .

@Thomas-by1td 2 жыл бұрын

Noticed that after you swap the o2 sensors, the long term FT reading from Bank2 didn’t change. Does bank 2 suppose get 50% fuel trim reading due to bad sensor?

@ToolDemos 2 жыл бұрын

I saw what you’re talking about and honestly can’t say for sure why that happened. My two theories on that are either programming or physical. It could be that the computer is programmed to correct over fueling more quickly than under fueling. Maybe to save the catalytic converter. On the other hand, it could’ve been the fact that I was handling that bad sensor and caused it to come back to life temporarily. Sometimes that happens with electrical devices if you tap on them a broken connection could be repaired for a short time.

@2Jeezuzisreal Ай бұрын

What's the technical name of that sensor.

@ToolDemos Ай бұрын

Air/fuel ratio sensor.

@tannerelliott6570 Жыл бұрын

Just bought one for 200 dollars hoping it will be a decent flip

@ToolDemos Жыл бұрын

Wow! Great find.

@YoutubeGold-dc5fd 7 ай бұрын

can you clean the sensor?

@ToolDemos 7 ай бұрын

Not to my knowledge.

@omarguerrero2200 2 жыл бұрын

This 2003 Toyota has the same sensors for the downstream and upstream. my 2002 Toyota has the same sensors and when I tried to replace them the A1auto shop and Auto Zone has two different sensors for my Toyota. They insist that I am wrong, I removed both the downstream and upstream and showed it to them and they said that according to VIN number Iam wrong. What do I do?

@ToolDemos 2 жыл бұрын

Hi Omar. I wonder if this is just a communication issue. The Highlander has 2 upstream sensors and 1 downstream. The upstream sensors are screwed into the exhaust manifold, one on each side of the engine. The downstream is attached to the pipe, just after the catalytic converter. They all kinda look the same, but upstream sensors are air/fuel ratio sensors, it’s the one I replaced in the video, and are pretty expensive. The downstream sensor is a simple O2 sensor and is pretty cheap. Did that help?

@adamwoodworth5758 Жыл бұрын

I'm going to try this....Sadly I have to start with cheap parts. If it lasts a little while will try and save up for better. Stupid question why not use cheap ones, can you clean ones you have or get rebuild. Thanks Oh and by watching several videos learned that's an a/f or air fuel ratio sensor...Not a oxygen sensor...very different but almost exact Looking part. And I can't even find a cheap one of those 😢

@ToolDemos Жыл бұрын

They are all very expensive. The cheaper ones will tend to send a signal that the computer does not like or understand and you will end up with the same problem. A good one like Denso will send a signal that the computer is expecting to see. Try rockauto.com that’s where I bought mine and the prices were much better.

@adamwoodworth5758 Жыл бұрын

@@ToolDemos thank you 😊

@elchinguengenchon Жыл бұрын

Will it work on a 2005. Highlander 4 cylinder? It has a hard start, runs fine but a have those codes P0171 and P0174. I really appreciate any suggestions.

@ToolDemos Жыл бұрын

Try unplugging the MAF sensor, see if it starts easier. If so, you might have a faulty one.

@elchinguengenchon 5 ай бұрын

I will try. Thanks.

@vanceplace1349 2 жыл бұрын

What about if you change all the o2 sensors and the problem seems to get worse? Any ideas?

@ToolDemos 2 жыл бұрын

At this point, Vance you need to look at live data to see what the ECU is seeing. If you have a scanner, look at your fuel trims; they are the biggest clue to what your engine is doing. Compare that data to O2 sensor and MAP/MAF data. All of these are sensors record the way your engine is breathing.

@robinhernandez9582 Жыл бұрын

Is there anyway I can get an answer from you I have a 2003 Toyota Highlander I change O2 sensors after driving 1-mile it went right back to dragging guzzling gas I know there's a third one could that be the reason

@ToolDemos Жыл бұрын

Do you have access to a scanner?

@robinhernandez9582 Жыл бұрын

Yes

@robinhernandez9582 Жыл бұрын

My check engine light came on that's how I knew the O2 sensors were no good when I change them it went off

@robinhernandez9582 Жыл бұрын

I also don't have four I have three could it be the third one that goes under the driver seat that goes to the computer

@ToolDemos Жыл бұрын

@@robinhernandez9582 very unlikely that #3 is causing your problem. What code did you see when you scanned it?

@narachan291 Жыл бұрын

thank you we do not have computer to testing how i can do it

@ToolDemos Жыл бұрын

Glad it helped.

@maximinoarias5002 Жыл бұрын

Don't make sense to me, so what it was the problem? If it was running to reach on gas

@ToolDemos Жыл бұрын

Yes, the oxygen sensor was not reading correctly. Because of that the engine computer was adding too much fuel.

@87studga Жыл бұрын

Hey I need help.. code p0171 and p0174 on my Toyota 4 runner and bank 1 and 2 I have bought so many parts but I have changed the sensor on them. Can u please help me?

@ToolDemos Жыл бұрын

Do you have a scanner with live data?

@87studga Жыл бұрын

Yes but I don’t have the one u have

@87studga Жыл бұрын

@@ToolDemos it’s driving poorly

@ToolDemos Жыл бұрын

@@87studga I would start by looking at the fuel trims. Is the computer adding more fuel? How much? Is it at idle or cruising?

@87studga Жыл бұрын

@@ToolDemos like 1000